John 7:3-6 reveals Jesus' brothers did not believe in him—contrasting with the true family he defines in Luke 8:21.

Acts 1:14 shows Mary and Jesus' brothers now united in prayer with the disciples—contrasting their earlier seeking in Luke 8:20.

Matthew 13:55 names Jesus' brothers (James, Joseph, Simon, Judas)—identifying the brothers mentioned in Luke 8:20.

Mark 6:3 also names Jesus' brothers (including Joses) and sisters, confirming the family from Luke 8:20.

Matthew 13:56 adds that Jesus had sisters, expanding the family picture alongside the brothers in Luke 8:20.

1 Corinthians 9:5 refers to 'the brothers of the Lord,' confirming their recognized role in the early church.

Galatians 1:19 identifies James as the Lord's brother, naming one of the brothers from Luke 8:20.